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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.drools.template;

import org.drools.template.objects.ObjectDataProvider;
import org.drools.template.parser.DefaultTemplateContainer;
import org.drools.template.parser.TemplateContainer;
import org.drools.template.parser.TemplateDataListener;

import java.io.InputStream;
import java.util.Collection;

/**
 * This class provides additional methods for invoking the template
 * compiler, taking the actual parameters from maps or objects.
 */
public class ObjectDataCompiler extends DataProviderCompiler {

    /**
     * Compile templates, substituting from a collection of maps or objects
     * into the given template.
     *
     * @param objs     the collection of maps or objects
     * @param template the template resource pathname
     * @return the expanded rules as a string
     */
    public String compile(final Collection objs, final String template) {
        final InputStream templateStream = this.getClass().getResourceAsStream(template);
        return compile(objs, templateStream);
    }

    /**
     * Compile templates, substituting from a collection of maps or objects
     * into the given template.
     *
     * @param objs           objs the collection of maps or objects
     * @param templateStream the template as a stream
     * @return the expanded rules as a string
     */
    public String compile(final Collection objs,
                          final InputStream templateStream) {
        TemplateContainer tc = new DefaultTemplateContainer(templateStream);
        closeStream(templateStream);
        return compile(new ObjectDataProvider(tc, objs),
                       new TemplateDataListener(tc));
    }
}